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If you feel the vibration in the steering wheel, it's related to the front tires. If you feel it in the seat, it's related to the rears or driveshaft / propshafts.

Generally a tire problem on a 15" tire is going to give you a shake at 55mph or so.

I SUSPECT you have a bad u-joint or prop-shaft that is giving you your 65mph vibration. Put it on jackstands, remove the wheels, and run the engine up to 3000 rpm in 5th, or have a friend do so while you WATCH the propshafts for vibration.

Agreed - if the steering wheel is shaking in your hand at 65 - the problem is most likely up front.

The front suspension on the 240Z - 280Z's are very sensitive. Almost anything out of spec. can cause a high speed vibration. As everyone suggests tire balance, wheel problems are perhaps the first thing to eliminate. Past that - worn shocks, ball joints, tie-rod ends, worn steering racks and more commonly tension/compression rod bushings that are shot.

The problem with worn tension/compression rod bushings was identified very early on - and Bolt-On-Parts developed a T/C Rod Kit to solve it. They replaced the rubber bushings with an Aluminum socket and hard plastic ball arrangement. I've been running one on my 72 240Z since about 1976. I found the Kit only after I had replaced every other part, bought new tires and had them balanced several different times - but still had the front end shakes at high speeds.

FWIW,

Carl B.

Agreed - if the steering wheel is shaking in your hand at 65 - the problem is most likely up front.

The front suspension on the 240Z - 280Z's are very sensitive. Almost anything out of spec. can cause a high speed vibration. As everyone suggests tire balance, wheel problems are perhaps the first thing to eliminate. Past that - worn shocks, ball joints, tie-rod ends, worn steering racks and more commonly tension/compression rod bushings that are shot.

The problem with worn tension/compression rod bushings was identified very early on - and Bolt-On-Parts developed a T/C Rod Kit to solve it. They replaced the rubber bushings with an Aluminum socket and hard plastic ball arrangement. I've been running one on my 72 240Z since about 1976. I found the Kit only after I had replaced every other part, bought new tires and had them balanced several different times - but still had the front end shakes at high speeds.

FWIW,

Carl B.

Carl,

I have the same problem as the OP, after going through some of the archives it sounds like a ball joint problem to me but I have read in a number of places that the T/C aluminum/plastic combo caused more problems than it solved and that going back to rubber was the best all around solution. Would be interested in everyone's opinion on this.

Especially, those that have a well balance Z and what components you have that make up your suspension.

Thanks

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